From SuspireWiki

The Gran Ballo (“Grand Ball”) is a major event for the Lancea Sanctum, a boisterous expression of covenant unity and merrymaking in the image of the predator’s cause. Each domain but the most ascetic has one, almost always on November 1 (the Day of the Dead), and every Sanctified of the domain is expected to attend. Costumes and other vibrant displays are highly suggested, and in some parishes required. A few dour Kindred come in the bare minimum of attire, but many of the Sanctified, especially among the clergy, come dressed to the nines, decked out in grandiose outfits. In fact, the more grandiloquent the costume, the greater the social attention.

Music features prominently, whether from a string quartet, an entire orchestra, or a local band. With music comes dancing — rarely are the dances modern, and usually take the form of anachronistic stepping (a Victorian waltz or Contredanse, a Renaissance gagliarda, even the Charleston). Aside from music and dancing, a Gran Ballo wouldn’t be complete without catering, would it? Lay members abduct mortal vessels in the nights prior to the Grand Ball, and reserve them as the Vitae sources for the event. The Sanctified unveil the vessels at the stroke of midnight, and in some parishes the mortals remain alive and awake, bound up for tasting and drinking. Some are held in claustrophobic cages, others strapped to ornate filigree crucifixes.